München 2004 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 36: Poster Quanteneffekte

Q 36.1: Poster

Donnerstag, 25. März 2004, 14:00–16:00, Schellingstr. 3

Polarization Entanglement with a Fiber-Sagnac Interferometer — •Joel Heersink, Aska Dolinska, Oliver Glöckl, Stefan Lorenz, Ulrik Andersen, and Gerd Leuchs — Zentrum für Moderne Optik, Universität Erlangen-Nürnberg, Staudtstr. 7 B/2, 91058, Erlangen, Germany

The polarization state of light, described by the Stokes parameters, has in recent years attracted much interest in the field of quantum optics and communication. This is largely due to the fact that these parameters, in contrast to the quadrature variables, can be measured directly without local oscillator methods. Thus, this approach holds particular promise for quantum cryptography. We report here on the results of an experiment producing polarization entanglement using femtosecond laser pulses at 1500 nm. The entanglement is generated by interfering a polarization squeezed beam with an auxiliary beam. The polarization squeezed beam consists of two phase matched, orthogonally polarized, amplitude squeezed beams which are simultaneously produced using an asymmetric fiber Sagnac interferometer with a polarization maintaining fiber. This entanglement is compared and contrasted with previous results from this experiment using a vacuum input in place of the auxiliary beam [1].

[1] J. Heersink et al., J. Opt. B: Quantum and Semiclassical Opt. 5, 492 (2003)